How to light my wardian case as terrarium?

[jl10011]

Excitingly, today I will have my standing wardian case delivered. The glass case part measures 18"x18" and approximately 24" high.
The question I've been obsessing over is how to light it. It seems like the catch is that it is *only* 18" wide, and I haven't been able to find T5 bulbs or fixtures in 18" length. (I did find one source, but the bulbs were only 10K, which from my reading, is too high on the spectrum.)
I expect to grow medium light, medium warmth miniatures in the terrarium. Given that the plants on the bottom of the case will be nearly 2 feet from light source, I'm guessing I'll need a lot of lumens.
I would greatly appreciate any suggestions, as I'm about to start pulling my hair out.
Thanks.

[jl10011]

any thoughts about this fixture and whether it would be sufficient?

Coralife Aqualight Single Linear Strip Compact Fluorescent Fixture, 1X96 Watt (quad), 6700K, 20 inch

[bodaciousbonsai]

that is the way to go for your tank plenty of light,